Log Message:
jj: update to 0.16.0.

## [0.16.0] - 2024-04-03

### Deprecations

* `jj move` was deprecated in favor of `jj squash`.

### Breaking changes

* The `git_head` template keyword now returns an optional value instead of a
  list of 0 or 1 element.

* The `jj sparse set --edit`/`--reset` flags were split up into `jj sparse
  edit`/`reset` subcommands respectively.

* The `jj sparse` subcommands now parse and print patterns as workspace-relative
  paths.

* The `jj log` command no longer uses the default revset when a path is specified.

### New features

* Config now supports rgb hex colors (in the form `#rrggbb`) wherever existing \ 
color names are supported.

* `ui.default-command` now accepts multiple string arguments, for more complex
  default `jj` commands.

* Graph node symbols are now configurable via templates
  * `templates.log_node`
  * `templates.op_log_node`

* `jj log` now includes synthetic nodes in the graph where some revisions were
  elided.

* `jj squash` now accepts `--from` and `--into` (also aliased as `--to`) if `-r`
  is not specified. It can now be used for all use cases where `jj move` could
  previously be used. The `--from` argument accepts a revset that resolves to
  more than one revision.

* Commit templates now support `immutable` keyword.

* New template function `coalesce(content, ..)` is added.

* Timestamps are now shown in local timezone and without milliseconds and
  timezone offset by default.

* `jj git push` now prints messages from the remote.

* `jj branch list` now supports a `--conflicted/-c` option to show only \ 
conflicted branches.

* `jj duplicate` and `jj abandon` can now take more than a single `-r` argument,
  for consistency with other commands.

* `jj branch list` now allows combining `-r REVISIONS`/`NAMES` and `-a` options.

* `--all` is now named `--all-remotes` for `jj branch list`

* There is a new global `--quiet` flag to silence commands' non-primary output.

* `jj split` now supports a `--siblings/-s` option that splits the target
  revision into siblings with the same parents and children.

* new function `working_copies()` for revsets to show the working copy commits \ 
of all workspaces.

### Fixed bugs

None.

## [0.15.1] - 2024-03-06

No code changes (fixing Rust `Cargo.toml` stuff).

## [0.15.0] - 2024-03-06

### Breaking changes

* The minimum supported Rust version (MSRV) is now 1.76.0.

* The on-disk index format changed. New index files will be created
  automatically, but it can fail if the repository is co-located and predates
  Git GC issues [#815](https://github.com/martinvonz/jj/issues/815). If
  reindexing failed, you'll need to clean up corrupted operation history by
  `jj op abandon ..<bad operation ID>`.

* Dropped support for the "legacy" graph-drawing style. Use \ 
"ascii" for a very
  similar result.

* The default log output no longer lists all tagged heads. Set `revsets.log =
  "@ | ancestors(immutable_heads().., 2) | heads(immutable_heads())"` \ 
to restore
  the old behavior.

* Dropped support for the deprecated `:` revset operator. Use `::` instead.

* `jj rebase --skip-empty` no longer abandons commits that were already empty
  before the rebase.

### New features

* Partial support for commit signing. Currently you can configure jj to \ 
"keep"
  commit signatures by making new ones for rewritten commits, and to sign new
  commits when they are created.

  This comes with out-of-the-box support for the following backends:
  * GnuPG
  * SSH

  Signature verification and an explicit sign command will hopefully come soon.

* Templates now support logical operators: `||`, `&&`, `!`

* Templates now support the `self` keyword, which is the current commit in `jj
  log`/`obslog` templates.

* `jj show` now accepts `-T`/`--template` option to render its output using
  template

* `jj config list` now accepts `-T`/`--template` option.

* `jj git fetch` now accepts `-b` as a shorthand for `--branch`, making it more
  consistent with other commands that accept a branch

* In the templating language, Timestamps now have a `.local()` method for
  converting to the local timezone.

* `jj next/prev` now infer `--edit` when you're already editing a non-head
  commit (a commit with children).

* A new built-in pager named `:builtin` is available on all platforms,
  implemented with [minus](https://github.com/arijit79/minus/)

* Set config `ui.log-synthetic-elided-nodes = true` to make `jj log` include
  synthetic nodes in the graph where some revisions were elided
  ([#1252](https://github.com/martinvonz/jj/issues/1252),
  [#2971](https://github.com/martinvonz/jj/issues/2971)). This may become the
  default depending on feedback.

* When creating a new workspace, the sparse patterns are now copied over from
  the current workspace.

* `jj git init --colocate` can now import an existing Git repository. This is
  equivalent to `jj git init --git-repo=.`.

* `jj git fetch` now automatically prints new remote branches and tags by default.

* `--verbose/-v` is now `--debug` (no short option since it's not intended to be \ 
used often)

* `jj move --from/--to` can now be abbreviated to `jj move -f/-t`

* `jj commit`/`diffedit`/`move`/`resolve`/`split`/`squash`/`unsquash` now accept
  `--tool=<NAME>` option to override the default.
   [#2575](https://github.com/martinvonz/jj/issues/2575)

* Added completions for [Nushell](https://nushell.sh) to `jj util completion`

* `jj branch list` now supports a `--tracked/-t` option which can be used to
  show tracked branches only. Omits local Git-tracking branches by default.

* Commands producing diffs now accept a `--context` flag for the number of
  lines of context to show.

* `jj` commands with the `-T`/`--template` option now provide a hint containing
  defined template names when no argument is given, assisting the user in making
  a selection.

### Fixed bugs

* On Windows, symlinks in the repo are now supported when Developer Mode is enabled.
  When symlink support is unavailable, they will be materialized as regular \ 
files in the
  working copy (instead of resulting in a crash).
  [#2](https://github.com/martinvonz/jj/issues/2)

* On Windows, the `:builtin` pager is now used by default, rather than being
  disabled entirely.

* Auto-rebase now preserves the shape of history even for merge commits where
  one parent is an ancestor of another.
  [#2600](https://github.com/martinvonz/jj/issues/2600)